These torque wrenches feature an easy-to-read digital display with auto shut-off and a built-in memory log that tracks the last 50 torque values you achieved. They have an alarm and flashing red light when set torque value is reached. 1/4" drive is 9" long and has 2.2-22.1 ft.-lbs. range 3/8" drive is 9" long and has 19.9-99.6 ft.-lbs. range 1/2" drive is 19" long and has 29.5-147.5 ft.-lbs. range Measure in four units: in. -lbs., ft. -lbs., Nm and kg-m